Thermal conductivity of irradiated tetragonal lithium aluminate

This is the authors' abstract. We don't add key points for this paper.

• Thermal conductivity of irradiated γ-LiAlO 2 decreases with ion irradiation. • Thermal conductivity of γ-LiAlO 2 reaches a minimum value of ≈ 1 W/(m·K) for fluences larger than 10 17 ions/cm 2 . • Ion irradiation of γ-LiAlO 2 diminishes the temperature dependence of its thermal conductivity. The effect of 120 keV He + + D + -ion irradiation on the thermal conductivity of ceramic tetragonal γ-LiAlO 2 is studied with time-domain thermoreflectance (TDTR) at temperatures between 300 and 700 K. The thermal conductivity of single crystal γ-LiAlO 2 is 13.5 W/(m·K) at 300 K, and scales with temperature like 1/ T . The thermal conductivity of unirradiated polycrystalline γ-LiAlO 2 is 7.4 W/(m·K). Irradiation at fluences of 1 ×, 5 ×, and 10 × 10 16 ions/cm 2 decreases the thermal conductivity by ≈ 30 %, 80 %, and 90 %. The effect of irradiation is saturated at ion fluences of 10 17 ions/cm 2 . Irradiation decreases the temperature dependence of the thermal conductivity. For ion fluences larger than 10 17 ions/cm 2 , the thermal conductivity reaches a minimum value of ≈ 1 W/(m·K) that is independent of temperature.